【摘要】：利用金相組織觀察(OM)、掃描電鏡分析(SEM)、透射電鏡觀察(TEM)以及硬度測試,研究固溶處理對7B04鋁合金顯微組織及硬度的影響。結果表明:實驗合金中的η相(Mg Zn_2)為易溶相,S相(Al_2Cu Mg)為難溶相,含F(xiàn)e雜質(zhì)相為不溶相;進行單級固溶處理時,隨著固溶溫度的升高,實驗合金的固溶程度、再結晶程度和再結晶晶粒尺寸增加,當溫度超過480℃時,出現(xiàn)過燒現(xiàn)象,力學性能惡化,7B04鋁合金淬火敏感性較高;雙級固溶可有效抑制合金再結晶、降低合金淬火敏感性,實驗條件下較好的雙級固溶工藝為(450℃,0.5 h)+(490℃,0.5 h),抑制合金再結晶效果最佳,經(jīng)120℃時效24 h后,硬度達到最大值,為204HV1。
[Abstract]:(OM), scanning electron microscope (SEM) was used to observe the microstructure and hardness of 7B04 aluminum alloy. The effect of solution treatment on the microstructure and hardness of 7B04 aluminum alloy was studied by means of (SEM), transmission electron microscope (TEM) and hardness test. The results show that 畏 phase (Mg Zn_2) is soluble phase, S phase (Al_2Cu Mg) is difficult to dissolve and Fe impurity phase is insoluble phase. With the increase of solution temperature, the degree of solid solution, the degree of recrystallization and the grain size of recrystallization increase. When the temperature exceeds 480 鈩，

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